On Tue, 14 Feb 2012 07:26:38 -0500, Lizette Koehler wrote:
>
>I think it was amazing that IBM was able to eliminate the need for
>DCB=(xxxxx) and just let us use the subparms.
> 
My conjecture is that the UNIX file systems provided the impetus for
this.  The designers wanted to allow RECFM, LRECL, and BLKSIZE
with PATH=, but prohibit other subparameters.  There was no
mechanism to make one parameter mutex with a subparameter
of a different parameter, and it was easier to allow the bare
attributes than to devise the needed mutex.

Or does the chronology and other evidence refute this?

-- gil

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